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Reza Khani , Shahrzad Jalali , Mahdis mohammadpour , Navid Mohammadi , Ghazal Parastooei , Seyed Vasim Hosseini , Fazeleh Sadeghzade Moarefi , Fatemeh Imanijoo

Abstract

Background and Purpose: MTA-based sealers have recently been introduced, which can be used as fillers in root treatments owing to their good biological properties. This study is to evaluate the retreatment capability of MTA-based sealer compared to AH-26 resin sealer mandibular premolar teeth using the ProTaper retreatment system.

Materials and Methods: In this experimental-laboratory study, 64 single-rooted mandibular premolar extracted teeth were collected using the ProTaper system with a size ranging to F3[30,9%] and were randomly divided into two groups of 32 according to the type of sealer. Then, they were filled out following the instructions of the manufacturer. For this aim, resin sealer (AH-26), gutta-percha with lateral compression method for the canals group 1, and gutta-percha and MTA sealer (Endoseal MTA) method for the canals group 2 were used. Removal of all specimens was done using ProTaper rotary retreatment system, and the time needed for this work was recorded consequently. In the next step, the specimens were longitudinally cut using a diamond disc, and digital periapical radiographs for each piece were prepared. The residual of the filling material in the radiographic image was calculated using Mann-Whitney (non-parametric) test. The level of significance was considered to be (P<0.05).

Findings: The residual of sealer was significantly higher in the group filled with MTA-based sealer compared to that of the group filled with AH-26 sealer (p<0.05). The time needed to remove the canal-filling material in the group filled with MTA-based sealer was significantly higher (p<0.05).

Results: The results of the present study showed that the residuals after retreatment in the canal walls are significantly higher if MTA-based sealer is used, and the ProTaper retreatment system is not able to completely remove this sealer from the root canal‎.